Mmetụta nke ciment na admixture ndakọrịta na ihe dị mma

(1) Mgbe ọdịnaya alkali dị na ciment dị elu, mmiri mmiri nke ihe ga-ebelata na nkwụsịtụ nkwụsị ga-abawanye n'oge, karịsịa mgbe ị na-eji ihe ndị na-ebelata mmiri na-emepụta ihe na-emepụta ihe na-adịghị ala sulfate. Mmetụta ahụ pụtakwara ìhè, ebe onye na-ebelata mmiri na-eme ka mmiri dị elu nwere ike ime ka ọnọdụ a dịkwuo mma. Nke a bụ tumadi n'ihi na calcium sulfate dị n'ime obere ihe na-ebelata mmiri na-emepụta n'oge njikọ na neutralization, ma nwee ezigbo mmiri solubility. Ya mere, mgbe ị na-eji ciment alkali dị elu, na-agbakwunye ụfọdụ sodium sulfate na hydroxyhydroxy acid salt retarders mgbe ị na-eme ka ihe na-ebelata mmiri na-eme ka mmiri dịkwuo mma na slump nke ihe ahụ.

(2) Mgbe ọdịnaya alkali nke ciment dị elu na uru pH nke polycarboxylate na-ebelata mmiri na-ebelata, ihe ahụ ga-ebu ụzọ mepụta mmeghachi omume neutralization acid-base. Ọ bụghị naanị na okpomọkụ nke ihe ahụ ga-ebili, ma ọ ga-eme ka hydration nke ciment dị ngwa ngwa. Mmiri mmiri na slump nke ihe ahụ ga-egosi nnukwu mfu n'ime obere oge. Ya mere, mgbe ị na-ezute simenti ndị yiri ya, ọ kacha mma ịghara iji citric acid retarders kama iji alkaline retarders kama, dị ka sodium hexametaphosphate, sodium polyphosphate, wdg, nke na-adị irè karị.

(3) Mgbe ọdịnaya alkali dị na ciment dị ala, mmiri mmiri nke kọnkịta dịkwa njọ. Mmetụta nke ịba ụba n'ụzọ kwesịrị ekwesị na usoro onunu ogwu abụghị ihe doro anya, na ihe ahụ na-adịkarị mfe ọbara ọgbụgba. Isi ihe kpatara ihe a bụ na ion sulfate na ciment ezughị ezu, nke na-ebelata mmetụta nke igbochi hydration nke tricalcium aluminate na ciment. N'oge a, a ga-agbakwunye ụfọdụ sulfates dị ka sodium thiosulfate n'oge ngwakọta iji gbakwunye alkali soluble na ciment.

(4) Mgbe ihe oozes odo slurry, nwere ọtụtụ pinholes na egosipụta, ọ nwere ike ihu ọma kpebisiri ike na nne mmanya na ciment siri ike imeghari ka onye ọ bụla ọzọ. N'oge a, ethers, esters, aliphatic na ndị ọzọ dị iche iche nne mmanya nwere ike ịgbakọta. N'otu oge ahụ, ọ dị mkpa iji tụlee mbenata ọnụ ọgụgụ nke nne mmanya na-ebelata mmiri dị ọcha, na-agbakwunye melamine na sodium hexametaphosphate wee jiri ihe kwesịrị ekwesị na-emepụta ihe na-eme ka ọkpụkpụ. Zere iji ngwaahịa dị ka thickeners. Iji thickeners agaghị eme ka afụ pụta, na-akpata oke ikuku ọdịnaya, mbelata ihe njupụta na doro anya ike ibelata. Ọ bụrụ na ọ dị mkpa, enwere ike ịgbakwunye tannic acid ma ọ bụ ndu edo edo.

(5) Mgbe akụkụ ụfụfụ nke enyemaka egweri na ciment dị elu, ihe ahụ na-adịkwa mfe ịcha odo na steeti dara ogbenye mgbe ọ ka dị ihe dị ka 10 sekọnd. Mgbe ụfọdụ, a na-eche n'ụzọ na-ezighị ezi na ọnụ ọgụgụ mbelata mmiri nke onye na-ebelata mmiri dị oke elu ma ọ bụ na-agbakwunye ikuku dị ukwuu n'oge nchịkọta. N'ezie, ọ bụ nsogbu na enyemaka nke simenti egweri. Mgbe ị na-ezute nsogbu a, a ghaghị iji defoamer mee ihe dị ka ọnụ ọgụgụ ụfụfụ nke enyemaka na-egweri, a pụghịkwa iji ihe ntinye ikuku mee ihe n'oge nchịkọta.